Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word balaenas could not be parsed. Trying a normal dictionary lookup:
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† bālaena (bālēna), ae, f., = φάλαινα, Engl. whale (cf. Fest. p. 25, and the letter B.), a whale, Plaut. Rud. 2, 6, 61; Plin. 9, 8, 7, § 21; 9, 13, 15, § 41; 11, 40, 95, § 235; Ov. M. 2, 9; Juv. 10, 14; Aus. Mos. 144.
bālaenācĭus (bālēn-), a, um, adj. [balaena], of whalebone: virga, Petr. 21, 2.